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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 08-14-2010   #1 (permalink)
ccarccrazy is offline Rookie


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Default 1966 Mustang 289 Exhaust manifold Torque Spec. Please

I'm hearing all kinds of torque specs for '66 289. A thread on this site stated 13-18 ft. lbs! That sounds like intake manifold rather than exhaust. The exhaust manifold bolts are 3/8" Shouldn't they be around 35 ft. lbs?

Also, should I use gaskets? This same site mentioned if you use gaskets you can crack the exhaust manifold. Is this true????

Also, how 'bout torque specs for timing cover and waterpump?

Thanks in advance for your responses.
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Unread 08-14-2010   #2 (permalink)
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My Shop Manual says 13 -18 ft/lbs, too. It also says to apply graphite grease to the mating surface, not a gasket.
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Unread 08-14-2010   #3 (permalink)
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Thank you Joe.
My aluminum intake manifold bolts state 15 ft/lbs. and they are only 5/16". It seems strange that cast iron exhaust manifolds with 3/8" bolts are 13-18 ft/lbs. I'm pretty sure they are grade 5. I found a torque website that states 36 lbs. for grade 5 3/8" bolts.

Unless I hear otherwise, I'll torque them to 13-18 ft/lbs.

Anyone know the timing cover and waterpump ft/lbs?
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Unread 08-14-2010   #4 (permalink)
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12 - 15 ft/lbs for both. The torque value for the exhaust probably seems low for the bolt size because of the extreme heat they are subject to. Trust me, after you run the engine a bit, they ain't comin' out!
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Unread 08-14-2010   #5 (permalink)
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Thanks again Joe. I'll bet if they were torqued tighter they might break with the heat expansion.
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